Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91d63f06ae83dc9…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 04:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9e4dcb51b66bafd8b138630f5fd8809d SHA-1: 653215892bf3b3d84ba6095dcb5e37db018abb7e SHA-256: a91d63f06ae83dc98f9dc96bca25e70e17dddf2ec55640829f3559c9dac62a71
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high-risk heuristic firing for 'Recovery secret / private key request', indicating a phishing attempt to steal sensitive user information. The document also leverages a link farm on compromised WordPress sites, suggesting a multi-stage attack designed to obscure the final malicious destination. The embedded JavaScript likely facilitates the redirection or collection of user-provided secrets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1320532e2---88581831148.pdf In PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/59690376d83399c8496628f10f2ef244/1207552926.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/24391728349.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/22709813521.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/fepevo.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/57579959806.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/josizozerejeravud.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/92672023179.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b284194cabcaf2cc8c86a5433d219b26/dumugitibigisonadixepuw.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f30fceb4bf---jazaletozetajixopebot.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/80989226014.pdfIn PDF document text
    • http://sswjeans.com/files/96624118555.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/bafokisuniz.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/829ee1165620c95a04b94a643a37354e/lafavewix.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/28594028080.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec83789f5---viwunotul.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/47811273357.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/biwavogamexewulegafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sign+application+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE669 17200 bytes
SHA-256: bd038a7bd6327a1e7f654d3537093d4eeac8f9361388ce8fb00768c5004734f8
font_01_sfnt_off00011360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B77 10464 bytes
SHA-256: 86b7211522c496d04f555c7b86c19ffc5d192141522df83fdb99ebabfc181ea1

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